EP0122176B1 - Tap with a convex flute - Google Patents

Tap with a convex flute Download PDF

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Publication number
EP0122176B1
EP0122176B1 EP84400494A EP84400494A EP0122176B1 EP 0122176 B1 EP0122176 B1 EP 0122176B1 EP 84400494 A EP84400494 A EP 84400494A EP 84400494 A EP84400494 A EP 84400494A EP 0122176 B1 EP0122176 B1 EP 0122176B1
Authority
EP
European Patent Office
Prior art keywords
tap
flute
chase
shape
convex
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP84400494A
Other languages
German (de)
French (fr)
Other versions
EP0122176A2 (en
EP0122176A3 (en
Inventor
Dominique Gavelle
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TARAUDS COURCELLE-GAVELLE
Original Assignee
TARAUDS COURCELLE-GAVELLE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by TARAUDS COURCELLE-GAVELLE filed Critical TARAUDS COURCELLE-GAVELLE
Priority to AT84400494T priority Critical patent/ATE52206T1/en
Publication of EP0122176A2 publication Critical patent/EP0122176A2/en
Publication of EP0122176A3 publication Critical patent/EP0122176A3/en
Application granted granted Critical
Publication of EP0122176B1 publication Critical patent/EP0122176B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
    • B23G5/00—Thread-cutting tools; Die-heads
    • B23G5/02—Thread-cutting tools; Die-heads without means for adjustment
    • B23G5/06—Taps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
    • B23G2200/00—Details of threading tools
    • B23G2200/18—Tools rotatable in both directions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
    • B23G2225/00—Materials of threading tools, workpieces or other structural elements
    • B23G2225/44—Titanium

Definitions

  • the present invention relates to a tap constituted by at least two combs peripherally separated by a flute.
  • the flute In conventional taps existing on the market, the flute has a concave profile. This shape brings a certain fragility to the tap, the cross section of the latter being reduced accordingly. This fragility leads in particular to a "wriggling" of the tool, in particular, during the tapping of hard metals. In the case of taps with a central oil hole, the brittleness is further increased by a further reduction in section.
  • the problem is therefore to find a flute profile which affects the resistance of the taps less.
  • Document DE-C-132.151 relates to a flat flute tap, each comb extending in a concave shape between its two flanks, which makes the longitudinal edges of the comb fragile.
  • document GB-A-15.820 relates to a tap with a convex flute, each comb extending in a convex shape between its two flanks. This tap has an increased resistance compared to the aforementioned taps.
  • the present invention aims to provide a tap even more resistant than the previous one.
  • the tap includes three combs.
  • the profile of the cutting flank of each comb is symmetrical with the profile of its rear cutting flank, with respect to a radius of the tap.
  • the flute bottom seen in the longitudinal section of the tap, is parallel to the longitudinal axis of the latter.
  • Figure 1 shows a cross section of a tap profile comprising combs (1) separated by flutes in each of which the bottom (2) is of convex radiated shape.
  • Dotted lines appearing a flute bottom in accordance with the prior art show the gain in section (3) obtained by the profile according to the invention.
  • the shape of the flute according to the invention is also characterized by the fact that the flute flanks (4a, 4b) have a straight profile, both the flanks (4a) corresponding to the working part and the flanks (4b) corresponding to the rear section, unlike the prior art, where the profile was concave and generated spouts at the ends.
  • the sidewall profile (4a, 4b) according to the invention therefore provides additional strength to the tap.
  • the sides (4a, 4b) having a rectilinear profile, they can be easily resharpened with a plate wheel, without concern for connection, whereas in the prior art, it was necessary to respect, during the sharpening, the curvature of the side.
  • the profile of the cutting flank (4a) of each comb (1) is symmetrical with the profile of its rear cutting flank (4b), with respect to a radius (5) of the tap. In this way, we are sure to obtain the same cutting power on the working part as on the rear cut. This allows the tool to take up and calibrate perfectly, when unscrewing, the tapped hole, especially if it is very hard materials. Experience indeed shows that the taps according to the prior art do not cut when unscrewing, and therefore, there is a jamming effect very often causing the breakage of the tool.
  • the radial cutting angle y of each comb extending between the cutting flank (4a) and a radius (11) passing through the neighboring edge (12) of the comb, is negative .
  • FIG. 2 represents a variant of the shape of the flute bottom according to the invention.
  • the flute bottom (6) is protruding V, shape which gives the tool increased rigidity.
  • Figure 3 shows another variant, where the flute bottom (7) is rectilinear.
  • the convex shape of the flute bottom (2, 6, 7) allows the chips to roll better, when they are long, or even to break better, when they are short, for example for hard metals.
  • the convex shape will be chosen in particular from the aforementioned shapes depending on the materials to be tapped.
  • the flute bottom generally has a certain taper, in the longitudinal direction of the tap, in order to strengthen the tool by increasing its section. Since, according to the invention, the section of the tool is already increased by a form of flute bottom (2, 6, 7) convex, it is possible to remove the longitudinal taper. The flute bottom (9) then being perfectly parallel to the longitudinal axis (8) of the tap, the evacuation of the chips is facilitated. This characteristic applies as well to taps with straight cut as for those with helical cut.
  • the invention finds an application for any problem of delicate tapping, in particular concerning very hard materials such as titanium, Waspalloy, etc. as well as all steels whose hardness is greater than 297 BRINNEL.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)
  • Cleaning Of Streets, Tracks, Or Beaches (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
  • Memory System Of A Hierarchy Structure (AREA)
  • Dowels (AREA)
  • Food-Manufacturing Devices (AREA)
  • Domestic Plumbing Installations (AREA)
  • Joints Allowing Movement (AREA)
  • Scissors And Nippers (AREA)

Abstract

1. Tap comprising at least two chases (1) peripherally separated by a flute in which, when it is seen in transverse section over the whole of its cutting length : - the base of the flute (2) is convex, notably starting from the end of the tap ; - the two flanks (4a, 4b) of each chase are straight and - each chase extends according to a convex shape (10) between its two flanks, characterised in that the radial cutting angle gamma of each chase is negative and in that the base of the flute (6) has a shape of a projecting V.

Description

La présente invention concerne un taraud constitué par au moins deux peignes périphériquement séparés par une goujure.The present invention relates to a tap constituted by at least two combs peripherally separated by a flute.

Dans les tarauds classiques existant sur le marché, la goujure présente un profil concave. Cette forme apporte une certaine fragilité au taraud, la section transversale de ce dernier étant réduire d'autant. Cette fragilité conduit notamment à un "frétillement" de l'outil, en particulier, lors du taraudage des métaux durs. Dans le cas de tarauds à trou d'huile central, la fragilité est encore accrue par une nouvelle diminution de section.In conventional taps existing on the market, the flute has a concave profile. This shape brings a certain fragility to the tap, the cross section of the latter being reduced accordingly. This fragility leads in particular to a "wriggling" of the tool, in particular, during the tapping of hard metals. In the case of taps with a central oil hole, the brittleness is further increased by a further reduction in section.

Le problème posé est donc de trouver un profil de goujure qui affecte moins la résistance des tarauds.The problem is therefore to find a flute profile which affects the resistance of the taps less.

Dans le document SU-A-294.694 est déduit un taraud dont l'extrémité travaillante possède une goujure à profil concave, tandis que la partie restante du taraud possède une goujure à profil convexe. Ainsi, si ladite partie restante est renforcée, l'extrémité travaillante est encore fragile.In document SU-A-294.694 is deduced a tap whose working end has a flute with a concave profile, while the remaining part of the tap has a flute with a convex profile. Thus, if said remaining part is reinforced, the working end is still fragile.

Le document DE-C-132.151 concerne un taraud à goujure plate, chaque peigne s'étendant selon une forme concave entre ses deux flancs, qui rend fragiles les bords longitudinaux du peigne.Document DE-C-132.151 relates to a flat flute tap, each comb extending in a concave shape between its two flanks, which makes the longitudinal edges of the comb fragile.

Enfin, le document GB-A-15.820 concerne un taraud à goujure convexe, chacue peigne s'étendant selon une forme convexe entre ses deux flancs. Ce taraud présente une résistance accrue par rapport aux tarauds précités.Finally, document GB-A-15.820 relates to a tap with a convex flute, each comb extending in a convex shape between its two flanks. This tap has an increased resistance compared to the aforementioned taps.

La présente invention vise à proposer un taraud encore plus résistant que le précédent.The present invention aims to provide a tap even more resistant than the previous one.

Elle concerne à cet effet urr taraud comprenant au moins deux peignes périphériquement séparés pr une goujure, dans lequel, lorsqu'il est observé en section transversale sur toute sa longueur de coupe:

  • - le fond de goujure est convexe, notamment à partir de l'extrémité du taraud;
  • - les deux flancs de chaque peige sont rectilignes; et
  • -chaque peigne s'étend selon une forme convexe entre ses deux flancs, (GB-A-15.820) caractérisé en ce que l'angle de coupe radiale de chaque peigne est négatif et en ce que le fond de goujure possède un profil en V saillant.
To this end, it relates to a tap tap comprising at least two peripherally separated combs for a flute, in which, when observed in cross section over its entire cutting length:
  • - the flute bottom is convex, in particular from the end of the tap;
  • - the two sides of each comb are straight; and
  • -each comb extends in a convex shape between its two sides, (GB-A-15.820) characterized in that the radial cutting angle of each comb is negative and in that the flute bottom has a V-profile projecting.

Avantageusement, le taraud comprend trois peignes.Advantageously, the tap includes three combs.

Avantageusement, le profil du flanc de coupe de chaque peigne est symétrique du profil de son flanc d'arrière coupe, par rapport à un rayon du taraud.Advantageously, the profile of the cutting flank of each comb is symmetrical with the profile of its rear cutting flank, with respect to a radius of the tap.

Avantageusement, le fond de goujure, vu dans la section longitudinale du taraud, est parallèle à l'axe longitudinal de celui-ci.Advantageously, the flute bottom, seen in the longitudinal section of the tap, is parallel to the longitudinal axis of the latter.

D'autres détails et avantages de l'invention apparaîtront au cours de la description qui suit d'un mode de réalisation non limitatif, à l'aide des figures montrant:

  • - en figure 1: un profil de taraud représentant une première forme de goujure selon l'invention.
  • - en figure 2 et 3: deux formes de goujure selon l'invention.
  • -en figure 4: une coupe longitudinale du taraud montrant le profil longitudinal de goujure selon l'invention.
Other details and advantages of the invention will appear during the following description of a nonlimiting embodiment, with the aid of the figures showing:
  • - In Figure 1: a tap profile representing a first form of flute according to the invention.
  • - In Figure 2 and 3: two forms of flute according to the invention.
  • in Figure 4: a longitudinal section of the tap showing the longitudinal flute profile according to the invention.

La figure 1 représente par une section transversale un profil de taraud comprenant des peignes (1) séparés par des goujures dans chacune desquelles le fond (2) est de forme rayonnée convexe. Des pointillés figurant un fond de goujure conforme à l'art antérieure mettent en évidence le gain de section (3) obtenu par le profil selon l'invention. La forme de la goujure selon l'invention se caractérise aussi par le fait que les flancs de goujure (4a, 4b) ont un profil reciligne, aussi bien les flancs (4a) correspondant à la partie travaillante que les flancs (4b) correspondant à l'arrière coupe, à la différence de l'art antérieur, où le profil était concave et engendrait des becs aux entrémités. Le profil des flancs (4a, 4b) selon l'invention apporte donc une solidité supplémentaire au taraud. De plus, le flancs (4a, 4b) ayant un profil rectiligne, ils peuvent être facilement réaf- fûtés aved une meule assiette, sans souci de raccordement, alors que dans l'art antérieur, il était nécessaire de respecter, lors de l'affûtage, la courbure du flanc.Figure 1 shows a cross section of a tap profile comprising combs (1) separated by flutes in each of which the bottom (2) is of convex radiated shape. Dotted lines appearing a flute bottom in accordance with the prior art show the gain in section (3) obtained by the profile according to the invention. The shape of the flute according to the invention is also characterized by the fact that the flute flanks (4a, 4b) have a straight profile, both the flanks (4a) corresponding to the working part and the flanks (4b) corresponding to the rear section, unlike the prior art, where the profile was concave and generated spouts at the ends. The sidewall profile (4a, 4b) according to the invention therefore provides additional strength to the tap. In addition, the sides (4a, 4b) having a rectilinear profile, they can be easily resharpened with a plate wheel, without concern for connection, whereas in the prior art, it was necessary to respect, during the sharpening, the curvature of the side.

Une autre caractéristique de l'invention est que le profil du flanc de coupe (4a) de chaque peigne (1) est symétrique du profil de son flanc d'arrière coupe (4b), par rapport à un rayon (5) du taraud. De cette façon, on est assuré d'obtenir le même pouvoir de coupe sur la partie travaillante que sur l'arrière coupe. Cela permet à l'outil de reprendre et de calibrer parfaitement, lors du dévissage, le trou tarraudé, surtout s'il s'agit de matériaux très durs. L'expérience montre en effet que les tarauds selon l'art antérieur ne coupent pas au dévissage, et de ce fait, il se produit un effet de coincement engendrant très souvent la rupture de l'outil.Another characteristic of the invention is that the profile of the cutting flank (4a) of each comb (1) is symmetrical with the profile of its rear cutting flank (4b), with respect to a radius (5) of the tap. In this way, we are sure to obtain the same cutting power on the working part as on the rear cut. This allows the tool to take up and calibrate perfectly, when unscrewing, the tapped hole, especially if it is very hard materials. Experience indeed shows that the taps according to the prior art do not cut when unscrewing, and therefore, there is a jamming effect very often causing the breakage of the tool.

Selon une autre caractéristique de l'invention, l'angle de coupe radiale y de chaque peigne, s'étendant entre le flanc de coupe (4a) et un rayon (11) passant par le bord voisin (12) du peigne, est négatif.According to another characteristic of the invention, the radial cutting angle y of each comb, extending between the cutting flank (4a) and a radius (11) passing through the neighboring edge (12) of the comb, is negative .

La figure 2 représente une variante de la forme du fond de goujure selon l'invention. Ici, le fond de goujure (6) est en V saillant, forme qui confère à l'outil une rigidité accrue.FIG. 2 represents a variant of the shape of the flute bottom according to the invention. Here, the flute bottom (6) is protruding V, shape which gives the tool increased rigidity.

La figure 3 représente une autre variante, où le fond de goujure (7) est rectiligne.Figure 3 shows another variant, where the flute bottom (7) is rectilinear.

La forme convexe du fond de goujure (2, 6, 7) permet aux copeaux de mieux rouler, lorsque ceux-ci sont longs, ou bien de mieux se casser, lorsqu'ils sont courts, par exemple pour les métaux durs.The convex shape of the flute bottom (2, 6, 7) allows the chips to roll better, when they are long, or even to break better, when they are short, for example for hard metals.

La forme convexe sera choisie notamment parmi les formes précités en fonction des matériaux à tarauder.The convex shape will be chosen in particular from the aforementioned shapes depending on the materials to be tapped.

Une caractéristique complémentaire de l'invention est représentée sur la figure 4. Selon l'art antérieur, le fond de goujure présente généralement une certaine conicité, dans le sens longitudinal du taraud, afin de renforcer l'outil en augmentant sa section. Puisque, selon l'invention, la section de l'outil est dèjà augmentée par une forme de fond de goujure (2, 6, 7) convexe, il est possible de supprimer la conicité longitudinale. Le fond de goujure (9) étant alors parfaitement parallèle à l'axe longitudinal (8) du taraud, l'évacuation des copeaux est facilitée. Cette carctéristque s'applique aussi bien pour les tarauds à coupe droite que pour ceux à coupe hélicoïdale.An additional feature of the invention is shown in Figure 4. According to the prior art, the flute bottom generally has a certain taper, in the longitudinal direction of the tap, in order to strengthen the tool by increasing its section. Since, according to the invention, the section of the tool is already increased by a form of flute bottom (2, 6, 7) convex, it is possible to remove the longitudinal taper. The flute bottom (9) then being perfectly parallel to the longitudinal axis (8) of the tap, the evacuation of the chips is facilitated. This characteristic applies as well to taps with straight cut as for those with helical cut.

L'invention trouve une application pour tout problème de taraudage délicat, notamment concernant les matériaux très durs tels que le titane, le Waspalloy, etc. ainsi que tous les aciers dont la dureté est supérieure à 297 BRINNEL.The invention finds an application for any problem of delicate tapping, in particular concerning very hard materials such as titanium, Waspalloy, etc. as well as all steels whose hardness is greater than 297 BRINNEL.

Claims (4)

1. Tap comprising at least two chases (1) peripherally separated by a flute in which, when it is seen in transverse section over the whole of its cutting length:
- the base of the flute (2) is convex, notably starting from the end of the tap;
-the two flanks (4a, 4b) of each chase are straight and
- each chase extends according to a convex shape (10) between its two flanks, characterised in that the radial cutting angle y of each chase is negative and in that the base of the flute (6) has a shape of a projecting V.
2. Tap according to Claim 1, characterised in that it comprises three chases (1).
3. Tap according to Claim 1 or 2, characterised in that the shape of the cutting flank (4a) of each chase (1) is symmetrical to the shape of its rear cutting flank (4b) with respect to a radius (5) of the tap.
4. Tap according to any one of Claims 1 to 3, characterised in that the base of the flute (9), seen in longitudinal section of the tap, is parallel to the longitudinal axis (8) of this.
EP84400494A 1983-03-14 1984-03-12 Tap with a convex flute Expired - Lifetime EP0122176B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84400494T ATE52206T1 (en) 1983-03-14 1984-03-12 TAP WITH OUTWARD FLUTE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8304122 1983-03-14
FR8304122A FR2542653B1 (en) 1983-03-14 1983-03-14 CONVEX FLUID TAP

Publications (3)

Publication Number Publication Date
EP0122176A2 EP0122176A2 (en) 1984-10-17
EP0122176A3 EP0122176A3 (en) 1985-01-23
EP0122176B1 true EP0122176B1 (en) 1990-04-25

Family

ID=9286822

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84400494A Expired - Lifetime EP0122176B1 (en) 1983-03-14 1984-03-12 Tap with a convex flute

Country Status (5)

Country Link
EP (1) EP0122176B1 (en)
AT (1) ATE52206T1 (en)
DE (1) DE3482033D1 (en)
ES (1) ES278172Y (en)
FR (1) FR2542653B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7665934B2 (en) 2006-10-18 2010-02-23 Kennametal Inc. Cutting tap and method of making a cutting tap
US7950880B2 (en) 2006-10-18 2011-05-31 Kennametal Inc. Spiral flute tap

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0305790B1 (en) * 1985-03-20 1993-01-13 Sharp Kabushiki Kaisha Production of graphite intercalation compound and doped carbon films
SE505742C2 (en) * 1993-09-07 1997-10-06 Sandvik Ab Threaded taps
SE522664C2 (en) * 2001-04-30 2004-02-24 Sandvik Ab Cutting thread pin and procedure for its manufacture
ATE267066T1 (en) * 2001-12-08 2004-06-15 Blickle Gmbh REAMER DEVICE WITH DEBURRING FUNCTION
JP6604462B2 (en) * 2017-06-19 2019-11-13 株式会社不二越 Tap

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE132151C (en) *
GB191515820A (en) * 1915-11-09 1916-08-03 Coventry Ordnance Works Ltd Improvements in Screw Cutting Taps.
US2033557A (en) * 1934-01-29 1936-03-10 Jesse D Tucker Tap
US2121380A (en) * 1937-09-25 1938-06-21 John Bath & Company Bottoming tap

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7665934B2 (en) 2006-10-18 2010-02-23 Kennametal Inc. Cutting tap and method of making a cutting tap
US7950880B2 (en) 2006-10-18 2011-05-31 Kennametal Inc. Spiral flute tap

Also Published As

Publication number Publication date
EP0122176A2 (en) 1984-10-17
FR2542653A1 (en) 1984-09-21
FR2542653B1 (en) 1987-02-20
ES278172Y (en) 1985-05-01
ES278172U (en) 1984-10-16
DE3482033D1 (en) 1990-05-31
EP0122176A3 (en) 1985-01-23
ATE52206T1 (en) 1990-05-15

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